DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-82Packet Bus Fault Isolation and Repair
5
■ TN464F Universal DS1: UDS1-BD, ISDN-LNK
■ TN771D Maintenance/Test: M/T-BD, M/T-DIG, M/T-PKT
Circuit Packs That Use the Packet Bus
This section describes the circuit packs that use the packet bus and the effects
of circuit pack and bus failures on each other.
Seven circuit packs can use the packet bus: The maintenance objects pertaining
to each circuit pack, (described further in Chapter 9), are listed in brackets.
■ TN1655 Packet Interface
[PKT-INTF] provides the SPE interface to the
packet bus (as the UN332 MSSNET does to the TDM Bus). All traffic on
the packet bus passes through the Packet Interface. The Packet Interface
can detect some control lead failures and many data lead failures via
parity errors on received data.
■ TN570 Expansion Interface
[EXP-INTF] connects the Port Networks
(PNs) in the system. (Only TN570s can be used in Release 5r). All Packet
traffic between PNs passes through a pair of TN570s (one in each port
network). The Expansion Interface can detect some control lead failures,
and many data lead failures via parity errors on received data.
■ TN556, TN2198, and TN2208 ISDN-BRI circuit packs
[BRI-BD,
BRI-PORT, ABRI-PORT, BRI-SET, BRI-DAT, ASAI-ADJ] carries signaling
information for ISDN-BRI station sets and data modules, as well as
signaling information and ASAI messages between the SPE and an ASAI
adjunct. The ISDN-BRI circuit pack has the same fault detection
capabilities as the TN570 Expansion Interface.
■ TN577 Packet Gateway circuit pack
[PGATE-BD, PGATE-PT] provides
X.25 connectivity to support external system adjuncts such as Audix
®
and DCS. The packet bus carries both signaling and customer traffic. The
Packet Gateway circuit pack has the same fault detection capabilities as
the TN570 Expansion Interface.
■ TN553 Packet Data circuit pack
[PDATA-BD, PDATA-PT] connects via a
backplane cable to a TN726B Data Line circuit pack in an adjacent carrier
slot. Together, the two circuit packs perform a protocol conversion from
mode 3 packet bus traffic originating in the SPE to mode 2 TDM Bus traffic
destined for external system devices and adjuncts. This connectivity is
referred to as a
System Port
. System Ports support devices and adjuncts
such as the System Printer, the PMS Journal Printer, the PMS Wakeup Log
Printer, data terminals, remote administration terminals, and equipment to
support the Call Detail Recording (CDR) feature. System Ports are also
used for saving and restoring System Announcements. The packet bus
carries both signaling and data for the Packet Data circuit pack. The
Packet Data circuit pack has the same fault detection capabilities as the
TN570 Expansion Interface.
